Infrared and Raman spectroscopic characterization of some organic substituted hybrid silicas

Capeletti, Larissa Brentano; Baibich, Ione Maluf; Butler, Ian S.; Santos, João Henrique Zimnoch dos

doi:10.1016/j.saa.2014.05.072

Cited by 60 publications

(55 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The shoulder at ~3600 cm −1 matches the OAH vibrations associated with alcohols that are a subproduct of sol-gel reaction, while the maximum at ~3425 cm −1 is related to surface -OH participating of hydrogen bonds. Water is also described here as a shoulder at ~3230 cm −1 , which is also observed at ~1630 cm [45].…”

Section: Ftir and Raman Modesmentioning

confidence: 59%

“…Another interesting behavior is reported to Si-O(H) band, considering that, in a general way for this case, the wave number shifts result from hydrogen bond formation with the silanol groups. A significantly higher wave number occurred for C 18 while the lower ones occurred for Clp and Gp [45]. The very hydrophobic C 18 organic chain can hinder hydrogen bond formation by comparison with the other samples, thus, the Si-O bond length is decreased and the wave number is shifted to higher values.…”

Section: Applications Of Molecular Spectroscopy To Current Research Imentioning

confidence: 91%

“…The same occurs for vibrational spectroscopy methods. A wide investigation was performed with a series of different hybrid silica prepared with tetraethoxysilane (C 0 ), methyltriethoxysilane (C 1 ), octyltriethoxysilane (C 8 ), octadecyltrimethoxysilane (C 18 ), vinyltrimethoxysilane (Vy), phenyltrimethoxysilane (Ph), mercaptopropyltrimethoxysilane (SHp), isocyanatepropyltriethoxysilane (NCOp), chloropropyltrimethoxysilane (Clp) and glycidoxypropyltrimethoxysilane (Gp) [45]. Using FTIR, the main bands of silica were well determined for all the hybrid silicas and they showed shifts depending on the organic group presenting at the network, although the organic groups' bands were barely seen.…”

Section: Ftir and Raman Modesmentioning

confidence: 99%

“…The last one can observe only some bands, while Raman presents a series of them showing the complementarity of both techniques for hybrid materials' characterization. Table 1 compiles some important assignments regarding the organic groups and their respective wave numbers detected by both techniques, when applicable [45].…”

Section: Applications Of Molecular Spectroscopy To Current Research Imentioning

confidence: 99%

See 3 more Smart Citations

Fourier Transform Infrared and Raman Characterization of Silica-Based Materials

Capeletti¹,

Zimnoch²

2016

Applications of Molecular Spectroscopy to Current Research in the Chemical and Biological Sciences

View full text Add to dashboard Cite

Fourier Transform Infrared and Raman are powerful techniques to evaluate silica and hybrid silica structure. It is possible to evaluate the silica network formation along the hydrolysis and condensation reactions in terms of siloxane rings formation and Si-O(-Si) angle deformation due to the introduction of organic groups, the employed synthetic route or encapsulated species interaction. The siloxane four-or six-membered rings imply in a more rigid or flexible network, respectively, in order to accommodate the organic groups. A structural analysis of the materials is of high importance, since interactions between the encapsulated molecules and the matrix are critical for the device performance, such as sensors. This type of device needs the permeation of an analyte to activate the encapsulated receptor molecules inside the silica structure. Fourier transform infrared spectrometry can be also used to determine parameters of the silica network as a function of the hydrophilicity/hydrophobicity degree and the siloxane ring structure with respect to thin film porosity. This silica structural analysis is reviewed along the text in a tentative of better exploring the data resulting from these powerful techniques. In addition, the functionalization of silica structures by the use of organoalkoxysilanes, which is important to the creation of high-specific materials, can be well described by these two complementary techniques. The Si-C bonds and the maintenance of the organic substituents such as methyl, octyl, octadecyl, vinyl, phenyl, aminopropyl, mercaptopropyl, isocyanatopropyl, iodopropyl, chloropropyl and glicydoxypropyl could be evaluated after the sol-gel synthesis process. The literature regarding silica vibrational spectroscopy is also explored creating a data bank of wave numbers for the most important bonds for different types of silica and hybrid silica materials obtained by different synthetic routes.

show abstract

Section: Ftir and Raman Modesmentioning

confidence: 59%

Section: Applications Of Molecular Spectroscopy To Current Research Imentioning

confidence: 91%

Section: Ftir and Raman Modesmentioning

confidence: 99%

Section: Applications Of Molecular Spectroscopy To Current Research Imentioning

confidence: 99%

See 2 more Smart Citations

Fourier Transform Infrared and Raman Characterization of Silica-Based Materials

Capeletti¹,

Zimnoch²

2016

Applications of Molecular Spectroscopy to Current Research in the Chemical and Biological Sciences

View full text Add to dashboard Cite

show abstract

“…, an associated silanol peak at 3450 cm −1 and the HeOH stretch peak attributed to interaction with adsorbed water on the sample at 3250 cm −1 [32,[43][44][45]. The spectra depicted in Fig.…”

Section: As Meshkova Et Al Surface and Coatings Technology 339 (2018mentioning

confidence: 94%

The role of carrier gas flow in roll-to-roll AP-PECVD synthesized silica moisture barrier films

Meshkova

Elam

Starostin

et al. 2018

Surface and Coatings Technology

View full text Add to dashboard Cite

Tomographic Volumetric Additive Manufacturing of Silicon Oxycarbide Ceramics

Kollep¹,

Konstantinou²,

Madrid‐Wolff³

et al. 2022

Adv Eng Mater

View full text Add to dashboard Cite

Over the past decades, ceramics have attracted much interest for their superior properties, including hardness, durability, and stability in extreme environments. They meet fabrication needs in various fields ranging from transportation industry (e.g., diesel engines) to the energy sector (e.g., nuclear) but also environment, defense, aerospace, and in the medical sector (e.g., ceramic thermal barrier coatings, filters, lightweight space mirrors, hip or knee implants). [1][2][3][4][5][6] However, the fabrication of complex ceramic parts remains very challenging. Mainly because of their hardness and brittleness, conventional manufacturing processes, such as machining or molding, are limited to simple object geometries as well as being costly and time-consuming. Additive manufacturing (AM) represents an attractive alternative. Not only does it offer more flexibility in terms of architecture and significantly reduce material waste but also it leads to cost-effective production in a shorter time. In the liquid-based AM technologies being used for the fabrication of ceramics, the process starts with a liquid preceramic polymer (PCP) that is first solidified into a 3D object: the so-called green body. The latter is then transformed into a ceramic material, generally denoted as polymer-derived ceramic (PDC), through a pyrolysis step. [7] Initially, PCP resins were processed or shaped using conventional polymer-forming techniques such as injection molding or extrusion. Later, it was demonstrated that by adding a photoinitiator to the liquid precursor, the solid green body can be formed by exposure to UV radiation. [8] Through photopolymerization, laser-based stereolithography (SLA) has enabled the fabrication of PCP components with high resolution and a good surface quality. [9] It consists of scanning a laser beam on the photosensitive PCP resin and selectively hardening the material, building the 3D green body

show abstract

Infrared and Raman spectroscopic characterization of some organic substituted hybrid silicas

Cited by 60 publications

References 18 publications

Fourier Transform Infrared and Raman Characterization of Silica-Based Materials

Fourier Transform Infrared and Raman Characterization of Silica-Based Materials

The role of carrier gas flow in roll-to-roll AP-PECVD synthesized silica moisture barrier films

Tomographic Volumetric Additive Manufacturing of Silicon Oxycarbide Ceramics

Contact Info

Product

Resources

About